Quantum Computing and Quantum Communication with Electrons

Colin P. Williams

Dong Chen, Jiemin Zhang

With the continuous progress of quantum computing and quantum communication technology, the application of quantum algorithms in future communication networks is increasingly promising. Quantum algorithms have computing power beyond traditional algorithms and can effectively improve the performance and security of communication networks, especially in the field of electronics and communication engineering, showing great potential. In this paper, the application of quantum algorithms in future communication networks is discussed in depth, focusing on the analysis of quantum communication protocols, the application of quantum computing in network optimization, and the innovative methods of quantum algorithms in enhancing network security. By systematically analyzing the basic principles, application examples and development trends of quantum algorithms, this paper aims to provide theoretical support and technical reference for the design and realization of future communication networks. Finally, this paper summarizes the current challenges in the application of quantum algorithms and looks forward to the future development direction of its wide application in electronics and communication engineering.

Daniel Loss, Guido Burkard, Eugene V. Sukhorukov

If the states of spins in solids can be created, manipulated, and measured at the single-quantum level, an entirely new form of information processing, quantum computing and quantum communication, will be possible. We review our proposed spin-quantum dot architecture for a quantum computer and review some recent results on a deterministic source of entanglement generated by coupling quantum dots. Addressing the feasibility of quantum communication with entangled electrons we consider a scattering set-up with an entangler and beam splitter where the current noise exhibits bunching behavior for electronic singlet states and antibunching behavior for triplet states. We show that spin currents can produce noise even in the absence of any charge currents.

Luming Duan, Wolfgang Dür, J. I. Cirac +3 more

Paul E. Black, D. Richard Kuhn, Carl J. Williams

Guido Burkard, Hans‐Andreas Engel, Daniel Loss

Control over electron-spin states, such as coherent manipulation, filtering and measurement promises access to new technologies in conventional as well as in quantum computation and quantum communication. We review our proposal of using electron spins in quantum confined structures as qubits and discuss the requirements for implementing a quantum computer. We describe several realizations of one- and two-qubit gates and of the read-in and read-out tasks. We discuss recently proposed schemes for using a single quantum dot as spin-filter and spin-memory device. Considering electronic EPR pairs needed for quantum communication we show that their spin entanglement can be detected in mesoscopic transport measurements using metallic as well as superconducting leads attached to the dots.